0.1.2.0 Ross Paterson <R.Paterson@city.ac.uk> Oct 2017 * Removed constraint on the type of null * Added versions of fmap and traverse passing the measures of both sides * Added new search function, a symmetrical generalization of split * Added Eq, Ord and Show instances for IntervalMap and PriorityQueue * Made low and high into separate functions * Updated for Monoid, Foldable, Traversable in Prelude * Made compatible with Semigroup/Monoid proposal